Title :
Measuring the fine structure constant, /spl alpha/, using helium fine structure
Author :
Shiner, D. ; Dixson, R.
Author_Institution :
Dept. of Phys., Yale Univ., New Haven, CT, USA
fDate :
June 27 1994-July 1 1994
Abstract :
The fine structure of the 2/sup 3/S-2/sup 3/P transition in helium has been precisely measured using laser excitation of an atomic beam. The results give /spl alpha//sup -1/=137.035853(3)(7)(99). The three values of standard deviation are from, respectively, the measured transition frequency, the frequency calibration, and helium theory (1978 value).<>
Keywords :
atomic beams; atomic fine structure; calibration; constants; frequency measurement; helium neutral atoms; measurement standards; 2/sup 3/S-2/sup 3/P transition; He; He theory; fine structure constant; frequency calibration; laser excitation; measured transition frequency; standard deviation; Atom lasers; Atomic beams; Atomic measurements; Calibration; Frequency measurement; Helium; Laser excitation; Laser theory; Laser transitions; Measurement standards;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333342
